To start with IMHO, going with a mail order tune is reallyno different than your grandparents taking their car to"Tune-Masters" for a tune-up......yes, they did change the plugs etc,but they were not there to fine tune the car just find the middle of the roadwhere the car runs and get it out of the shop. Mail order tuners are nodifferent...anyone who claims they can tune your car without ever seeing it isselling camel poop- period! They cannot tune your engine without seeing thedata specific to altitude, humidity & fuel burning characteristics- justbecause you use 93 octane does not mean the 93 octane they used on their dyno (tuners)has the same burning characteristics...nor do they typically address theseasonal fuel blends for each region of the US.
It is important to verify the “Tuner” is ASE certified in ECM& Trans
programming & current. Plenty of persons advertise theirprograms to be the best & offer custom tunes, but very few have credentialsin these areas. Some of these “geniuses” have caused damage to a few vehicles-just jump over to flatratetech.com & read comments from the MSE techs and include Roush!!!!!!!
Roush Dyno Tune Posted August 26, 2012 http://forums.vintage-mustang.com/vi...need-help.html
Perhaps the most important item is……these "mail ordertuners' are not regulated like any other auto repair shop in the US
...so ifthey "damage" your car...gee, sorry...sue me!
IMHO, if you live near any major city there are excellenttuning specialists with dynos who for the same price (if not less) will tuneyour vehicle taking into consideration your specific needs includingenvironmental conditions, for your specific vehicle. IMHO, the best bang forthe buck! If you are comfortable and understand how to tune a vehicle,you can also do this yourself including HP Tuners, they offer two core programs, onefor those who are doing dyno tuning and one for the home-garage mechanic (whichis priced at about the same as most of the “canned tunes on the market) …thisversion limits the span of adjustments as a safeguard against doing somethingoutside of the oem scope……basically, keeps you from doing something “too stupidby accident” (grin)